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Here we show that these geometries can be accessed by supramolecular enforcement, and challenge its connection to the VSEPR model. Bowl\u2010shaped calix[4]pyrrolato indium units preorganize four lithium ions into a confined Li\n                    <jats:sub>4<\/jats:sub>\n                    pocket that traps Cl\n                    <jats:sup>\u2212<\/jats:sup>\n                    , Br\n                    <jats:sup>\u2212<\/jats:sup>\n                    , and I\n                    <jats:sup>\u2212<\/jats:sup>\n                    in strongly flattened to ideal planar tetracoordinate environments. Computational analysis of the parent tetrahedral [Li\n                    <jats:sub>4<\/jats:sub>\n                    X]\n                    <jats:sup>3<\/jats:sup>\n                    <jats:sup>+<\/jats:sup>\n                    units reveals small planarization energies that can be overcome by a charge\u2010attenuating host of appropriate shape. The experimental series shows that halide planarity is highly sensitive to subtle supramolecular effects, such as calix[4]pyrrolato doming and crystal packing, experimentally confirming the generally low angular deformation energies. The results establish supramolecular enforcement as a rational design principle for planar tetracoordinate heavier halides and show that such motifs are accessible outcomes of engineered electrostatic cavities.\n                  <\/jats:p>","DOI":"10.1002\/anie.1850882","type":"journal-article","created":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T03:43:25Z","timestamp":1792554205000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Supramolecular Enforcement of Planar Tetracoordinate Halides"],"prefix":"10.1002","author":[{"given":"Jie","family":"Zhang","sequence":"first","affiliation":[{"name":"Anorganisch\u2010Chemisches Institut Ruprecht\u2010Karls\u2010Universit\u00e4t Heidelberg  Heidelberg 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